2,3-dihydro-5 and 6-substituted-2-phenyl-4(1h)-quinazolinones



United States Patent 3,455,920 2,3-DlHYDRO- AND G-SUBS'I'ITUTED-Z-PHENYL- 4(1H)-QUINAZOLINONES Harry L. Yale, New Brunswick, NJ., assignor to E. R. Squibb & Sons, Inc., New York, N.Y., a corporation of Delaware No Drawing. Filed Jan. 13, 1967, Ser. No. 609,002

Int. Cl. C07d 51/46 US. Cl. 260-251 7 Claims ABSTRACT 0F THE DISCLOS This invention relates to novel nitro, hydroxy or hydroxyamino substituted 2,3 dihydro 2-phenyl-4(1H)- quinazolinones. These compounds have shown cytotoxic activity.

This invention relates to a novel quinazolinone of the formula wherein R is a radical selected from the group consisting of nitro, hydroxy and hydroxyamino.

Preferred compounds in accordance with the above formula include 2,3-dihydro-6-nitro-2-phenyl-4( 1H)-quinazolinone;

2,3 -dihydro-S-hydroxy-2-phenyl-4( 1H) -quinazolinone;

2,3-dihydro-6-hydroxy-2-phenyl-4( 1H) -quinazolinone;

2,3-dihydro-5-nitro-2-phenyl-4( 1H)-quinazolinone;

2,3-dil1ydro-6- (hydroxylamino) -2-phenyl-4( 1H)-quinazolinone; and

2,3-dihydro-S-hydroxylamino-2-phenyl-4(1H)-quinazolinone.

The compounds of this invention have shown a high degree of activity in inhibiting the multiplication of Earles L cell line of mouse fibroblasts growing in suspension according to the test procedure of Perlman, et al., Proc. Soc. Exptl. Biol. Med, 102 290 (1959), having an ED of 6 meg/ml. in this test. ED is the concentration required to accomplish a 50% inhibition of normal multiplication. In addition, these compounds have shown in vivo cytotoxic activity in the Walker carcinoma 256 tumor system.

The compound of this invention is prepared in accordance with the following reaction schema:

In this reaction, the reactants are heated in a solvent with a boiling point between 100-160 C., e.g., toluene or chlorobenzene with an acidic catalyst, e.g., p-toluenesulfonic acid, and the water formed in the reaction removed by means of calcium hydride. Alternately, the reaction may be carried out under reflux, in the presence of an alcohol, e.g., methanol, ethanol, 2-propanol, or n-propa- 3,455,920. Patented July 15, 1969 EXAMPLE 1 2,3-dihydro-6-nitro-2-phenyl-4( 1H) -quinazolinone A mixture of 0.2 g. of p-toluenesulfonic acid monohydrate and 250 ml. of chlorobenzene is distilled in a special apparatus constructed so that the condensed vapors percolate downward through a supported bed of 814 mesh calcium hydride and are dried by that reagent aldehyde are added. The distillation of this mixture in the same apparatus is continued until there is no evidence of reaction with the calcium hydride (about one hour). The solid which separates on cooling the reaction mixture is filtered; when air-dried, it weighs 4.8 g. Recrystallization from 500 ml. of n-propanol-water (2:1) gives 4.0 g. of 2,3 dihydro-6-nitro-2-phenyl-4(1H)-quinazolinone, M.P. 263270 dec.

EXAMPLE 2 2,3dihydro-5-hydroxy-2-phenyl-4( 1H) -quinazolinone (a) 2-amino-6-hydroxybenzamide is prepared by the following synthetic sequence: 4-nitroisatin is catalytically hydrogenated over a palladium catalyst to give 4-aminoisatin; the 4-aminoisatin is diazotized, and the diazonium compound decomposed to give 4-hydroxyisatin; the 4-hydroxyisatin is treated with :be'nzoyl chloride in aqueous sodium hydroxide to give 4-(benzoyloxy)isatin; the 4- (benzoyloxyfisatin is treated with chromic oxide in acetic acid to give 5-(benzoyloxy)isatoic anhydride; and, the 5- (benzoyloxy)isatoic anhydride is treated with aqueous ammonia to give 2-amino-6-hydroxybenzamide.

(b) Following the procedure of Example 1 but substituting 3.1 g. of the 2-amino-6-hydroxybenzamide for the 2-amino-5-nitrobenzamide, there is obtained the desired product, 2,3 dihydro-S-hydroxy-2-phenyl-4(1H)-qninazolinone.

EXAMPLE 3 2,3-dihydro-6-hydroxy-2-phenyl-4(1H)-qninazolinone (a) Following the procedure of Example 1 but substituting 3.1 g. of 2-amino-5-hydroxybenzamide for the 2- amino-5-nitrobenzamide, there is obtained the desired product, 2,3 dihydro-6-hydroxy-2-phenyl-4(1H)-quinazolinone.

(b) By substituting S-nitroisatin for the 4-nitroisatin in Example 3(b), there is obtained the desired intermediate, Z-amino-5-hydroxybenzamide.

EXAMPLE 4 2,3-dihydro-5 -nitro-2-pheny1-4( 1H) -quinazo1inone (a) Following the procedure of Example 1 but substituting 3.62 g. of 2-amino-6-nitrobenzamide for the 2- amino-5-nitrobenzamide, there is obtained 2,3-dihydro-5- nitro-2-phenyl-4( 1H)-quinazo1inone.

(b) When 4-nitroisatin is treated with chromic oxide in acetic acid, there is obtained 5-nitroisatoic anhydride; 5- nitroisatoic anhydride and aqueous ammonia give 2-amino-fi-nitrobenzamide.

EXAMPLE 5 2,3-dihydro-6-(hydroxylamino)-2-phenyl-4(1H)-quinazolinone To a suspension of 4.0 g. of 2,3-dihydro-6-nitro-2-phen-,

1. A compound of the formula wherein R is a radical selected from the group consisting of nitro, hydroxy and hydroxyamino.

3. A compound in accordance with claim 1 having the name 2,3 dihydro-5 hydroxy-2-phenyl-4(1H)-quinazolinone.

4. A compound in accordance with claim 1 having the name 2,3 dihydro-6-hydroxy-2-phenyl-4(1H)-quinazolinone.

5. A compound in accordance with claim 1 having the name 2,3 dihydro 6 hydroxylamino-2-phenyl-4(1H)- quinazolinone.

6. A compound in accordance with claim 1 having the name 2,3 dihydro 5 hydroxylamino-2-phenyl-4(1H)- quinazolinone.

7. A compound in accordance with claim 1 having the name 2,3-dihydro 5-nitro-2-phenyl-4( lH)-quinazolinone.

vReferences Cited UNITED STATES PATENTS 3,162,636 12/1964 Gurien et al 260-25l NICHOLAS S. RIZZO, Primary Examiner R. V. RUSH, Assistant Examiner US. Cl. X.R.

2. A compound in accordance with claim 1 having the 25 260-999 name 2,3-dihydro-6-nit1'o-2-phenyl-4( 1H) -quinazolinone. 

